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Apparatus and methods for detecting wet and icy conditions

  • US 4,897,597 A
  • Filed: 12/08/1988
  • Issued: 01/30/1990
  • Est. Priority Date: 12/08/1988
  • Status: Expired due to Term
First Claim
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1. Apparatus for detecting the presence and condition of precipitation on the surface of a pathway, comprising:

  • a block of electrically insulative material adapted to be embedded in the pathway and having a top surface exposed to precipitation; and

    sensor means embedded in said block for sensing a physical property of the precipitation to produce a sensor output which is also influenced by a depth of the precipitation, wherein part of the top surface of the block has a well that is generally curved in outline above said sensor means for gathering precipitation for said sensor means, thereby diminishing the influence of precipitation depth on said sensor means.

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